Merge branch '1.20.1' into 1.20.2

assets/models/mimic.java

@@ -0,0 +1,66 @@
+// Made with Blockbench 4.9.4
+// Exported for Minecraft version 1.17+ for Yarn
+// Paste this class into your mod and generate all required imports
+
+package com.example.mod;
+   
+public class mimic extends EntityModel<Entity> {
+	private final ModelPart lid;
+	private final ModelPart tongue_r1;
+	private final ModelPart upper_teeth;
+	private final ModelPart cube_r1;
+	private final ModelPart lower_teeth;
+	private final ModelPart cube_r2;
+	private final ModelPart right_leg;
+	private final ModelPart left_leg;
+	public mimic(ModelPart root) {
+		this.lid = root.getChild("lid");
+		this.lower_teeth = root.getChild("lower_teeth");
+		this.right_leg = root.getChild("right_leg");
+		this.left_leg = root.getChild("left_leg");
+	}
+	public static TexturedModelData getTexturedModelData() {
+		ModelData modelData = new ModelData();
+		ModelPartData modelPartData = modelData.getRoot();
+		ModelPartData lid = modelPartData.addChild("lid", ModelPartBuilder.create(), ModelTransform.of(0.0F, 17.0F, -7.0F, -0.829F, 0.0F, -3.1416F));
+
+		ModelPartData tongue_r1 = lid.addChild("tongue_r1", ModelPartBuilder.create().uv(11, 34).cuboid(-3.0F, -10.0F, 1.0F, 6.0F, 1.0F, 8.0F, new Dilation(0.0F)), ModelTransform.of(0.0F, 7.0F, 7.0F, 0.5236F, 0.0F, 0.0F));
+
+		ModelPartData upper_teeth = lid.addChild("upper_teeth", ModelPartBuilder.create().uv(0, 0).cuboid(-1.0F, -8.0F, 5.0F, 2.0F, 4.0F, 1.0F, new Dilation(0.0F))
+		.uv(0, 0).cuboid(-4.0F, -8.0F, 5.0F, 2.0F, 4.0F, 1.0F, new Dilation(0.0F))
+		.uv(0, 0).cuboid(2.0F, -8.0F, 5.0F, 2.0F, 4.0F, 1.0F, new Dilation(0.0F)), ModelTransform.pivot(0.0F, 7.0F, 7.0F));
+
+		ModelPartData cube_r1 = upper_teeth.addChild("cube_r1", ModelPartBuilder.create().uv(0, 0).cuboid(-6.0F, -1.0F, -6.0F, 2.0F, 4.0F, 1.0F, new Dilation(0.0F))
+		.uv(0, 0).cuboid(-9.0F, -1.0F, -6.0F, 2.0F, 4.0F, 1.0F, new Dilation(0.0F))
+		.uv(0, 0).cuboid(-12.0F, -1.0F, -6.0F, 2.0F, 4.0F, 1.0F, new Dilation(0.0F))
+		.uv(0, 0).cuboid(-6.0F, -1.0F, 5.0F, 2.0F, 4.0F, 1.0F, new Dilation(0.0F))
+		.uv(0, 0).cuboid(-9.0F, -1.0F, 5.0F, 2.0F, 4.0F, 1.0F, new Dilation(0.0F))
+		.uv(0, 0).cuboid(-12.0F, -1.0F, 5.0F, 2.0F, 4.0F, 1.0F, new Dilation(0.0F)), ModelTransform.of(0.0F, -7.0F, -7.0F, 0.0F, 1.5708F, 0.0F));
+
+		ModelPartData lower_teeth = modelPartData.addChild("lower_teeth", ModelPartBuilder.create().uv(0, 0).cuboid(-1.0F, -1.0F, 12.0F, 2.0F, 4.0F, 1.0F, new Dilation(0.0F))
+		.uv(0, 0).cuboid(-4.0F, -1.0F, 12.0F, 2.0F, 4.0F, 1.0F, new Dilation(0.0F))
+		.uv(0, 0).cuboid(2.0F, -1.0F, 12.0F, 2.0F, 4.0F, 1.0F, new Dilation(0.0F)), ModelTransform.pivot(0.0F, 16.0F, -7.0F));
+
+		ModelPartData cube_r2 = lower_teeth.addChild("cube_r2", ModelPartBuilder.create().uv(0, 0).cuboid(-6.0F, -1.0F, -6.0F, 2.0F, 4.0F, 1.0F, new Dilation(0.0F))
+		.uv(0, 0).cuboid(-9.0F, -1.0F, -6.0F, 2.0F, 4.0F, 1.0F, new Dilation(0.0F))
+		.uv(0, 0).cuboid(-12.0F, -1.0F, -6.0F, 2.0F, 4.0F, 1.0F, new Dilation(0.0F))
+		.uv(0, 0).cuboid(-6.0F, -1.0F, 5.0F, 2.0F, 4.0F, 1.0F, new Dilation(0.0F))
+		.uv(0, 0).cuboid(-9.0F, -1.0F, 5.0F, 2.0F, 4.0F, 1.0F, new Dilation(0.0F))
+		.uv(0, 0).cuboid(-12.0F, -1.0F, 5.0F, 2.0F, 4.0F, 1.0F, new Dilation(0.0F)), ModelTransform.of(0.0F, 0.0F, 0.0F, 0.0F, 1.5708F, 0.0F));
+
+		ModelPartData right_leg = modelPartData.addChild("right_leg", ModelPartBuilder.create().uv(7, 30).cuboid(-2.5F, -1.5F, -3.0F, 5.0F, 7.0F, 6.0F, new Dilation(0.0F)), ModelTransform.pivot(3.5F, 25.5F, 1.0F));
+
+		ModelPartData left_leg = modelPartData.addChild("left_leg", ModelPartBuilder.create().uv(7, 30).mirrored().cuboid(-9.5F, -1.5F, -3.0F, 5.0F, 7.0F, 6.0F, new Dilation(0.0F)).mirrored(false), ModelTransform.pivot(3.5F, 25.5F, 1.0F));
+		return TexturedModelData.of(modelData, 64, 64);
+	}
+	@Override
+	public void setAngles(Entity entity, float limbSwing, float limbSwingAmount, float ageInTicks, float netHeadYaw, float headPitch) {
+	}
+	@Override
+	public void render(MatrixStack matrices, VertexConsumer vertexConsumer, int light, int overlay, float red, float green, float blue, float alpha) {
+		lid.render(matrices, vertexConsumer, light, overlay, red, green, blue, alpha);
+		lower_teeth.render(matrices, vertexConsumer, light, overlay, red, green, blue, alpha);
+		right_leg.render(matrices, vertexConsumer, light, overlay, red, green, blue, alpha);
+		left_leg.render(matrices, vertexConsumer, light, overlay, red, green, blue, alpha);
+	}
+}

src/main/java/com/minelittlepony/unicopia/UTags.java

@@ -104,6 +104,7 @@ public interface UTags {
         TagKey<Block> KICKS_UP_DUST = block("kicks_up_dust");
 
         TagKey<Block> POLEARM_MINEABLE = block("mineable/polearm");
+        TagKey<Block> MIMIC_CHESTS = block("mimic_chests");
 
         TagKey<Block> BUTTERFLIES_SPAWNABLE_ON = block("butterflies_spawn_on");
 

src/main/java/com/minelittlepony/unicopia/block/WeatherVaneBlock.java

@@ -3,6 +3,8 @@ package com.minelittlepony.unicopia.block;
 import org.jetbrains.annotations.Nullable;
 
 import com.minelittlepony.unicopia.USounds;
+import com.minelittlepony.unicopia.particle.TargetBoundParticleEffect;
+import com.minelittlepony.unicopia.particle.UParticles;
 import com.minelittlepony.unicopia.server.world.WeatherConditions;
 
 import net.minecraft.block.*;
@@ -51,6 +53,9 @@ public class WeatherVaneBlock extends BlockWithEntity {
 
         private float clientAngle;
         private float prevAngle;
+        private float lastAngle;
+
+        private Vec3d airflow = Vec3d.ZERO;
 
         public WeatherVane(BlockPos pos, BlockState state) {
             super(UBlockEntities.WEATHER_VANE, pos, state);
@@ -63,11 +68,14 @@ public class WeatherVaneBlock extends BlockWithEntity {
         @Override
         public void readNbt(NbtCompound nbt) {
             angle = nbt.getFloat("angle");
+            airflow = new Vec3d(nbt.getDouble("windX"), 0, nbt.getDouble("windZ"));
         }
 
         @Override
         protected void writeNbt(NbtCompound nbt) {
             nbt.putFloat("angle", angle);
+            nbt.putDouble("windX", airflow.x);
+            nbt.putDouble("windZ", airflow.z);
         }
 
         @Override
@@ -82,23 +90,26 @@ public class WeatherVaneBlock extends BlockWithEntity {
 
         public static void serverTick(World world, BlockPos pos, BlockState state, WeatherVane entity) {
             Vec3d airflow = WeatherConditions.get(world).getWindDirection();
-            float angle = (float)Math.atan2(airflow.x, airflow.z) + MathHelper.PI;
+            float angle = (WeatherConditions.get(world).getWindYaw() % MathHelper.PI);
-            if (Math.signum(entity.angle) != Math.signum(angle)) {
-                angle = MathHelper.PI - angle;
-            }
-            angle %= MathHelper.PI;
 
+            entity.lastAngle = entity.prevAngle;
+            entity.prevAngle = entity.angle;
             if (angle != entity.angle) {
                 entity.angle = angle;
+
+                entity.airflow = airflow;
                 entity.markDirty();
-                if (world instanceof ServerWorld serverWorld) {
+                if (world instanceof ServerWorld sw) {
-                    serverWorld.getChunkManager().markForUpdate(pos);
+                    sw.getChunkManager().markForUpdate(pos);
                 }
 
+                if (entity.lastAngle == entity.prevAngle) {
                     world.playSound(null, pos.getX(), pos.getY(), pos.getZ(), USounds.BLOCK_WEATHER_VANE_ROTATE, SoundCategory.BLOCKS, 1, 0.5F + (float)world.random.nextGaussian());
                 }
             }
 
+        }
+
         public static void clientTick(World world, BlockPos pos, BlockState state, WeatherVane entity) {
             entity.prevAngle = entity.clientAngle;
 
@@ -111,6 +122,18 @@ public class WeatherVaneBlock extends BlockWithEntity {
             } else if (entity.clientAngle > angle) {
                 entity.clientAngle -= step;
             }
+
+            if (world.random.nextInt(3) == 0) {
+                float radius = 10;
+                for (int i = 0; i < 5; i++) {
+                    world.addImportantParticle(new TargetBoundParticleEffect(UParticles.WIND, null),
+                            world.getRandom().nextTriangular(pos.getX(), radius),
+                            world.getRandom().nextTriangular(pos.getY(), radius),
+                            world.getRandom().nextTriangular(pos.getZ(), radius),
+                            entity.airflow.x / 10F, 0, entity.airflow.z / 10F
+                    );
+                }
+            }
         }
     }
 }

src/main/java/com/minelittlepony/unicopia/client/KeyBindingsHandler.java

@@ -104,7 +104,7 @@ public class KeyBindingsHandler {
             changePage(client, maxPage, -1);
         } else if (page < maxPage && pageUp.getState() == PressedState.PRESSED) {
             changePage(client, maxPage, 1);
-        } else {
+        } else if (!client.player.isSpectator()) {
             for (Binding i : keys.keySet()) {
                 AbilitySlot slot = keys.get(i);
                 if (slot == AbilitySlot.PRIMARY && client.options.sneakKey.isPressed() && abilities.isFilled(AbilitySlot.PASSIVE)) {

src/main/java/com/minelittlepony/unicopia/client/URenderers.java

@@ -22,6 +22,8 @@ import com.minelittlepony.unicopia.client.particle.RainbowTrailParticle;
 import com.minelittlepony.unicopia.client.particle.RaindropsParticle;
 import com.minelittlepony.unicopia.client.particle.ShockwaveParticle;
 import com.minelittlepony.unicopia.client.particle.SphereParticle;
+import com.minelittlepony.unicopia.client.particle.SpiralParticle;
+import com.minelittlepony.unicopia.client.particle.WindParticle;
 import com.minelittlepony.unicopia.client.render.*;
 import com.minelittlepony.unicopia.client.render.entity.*;
 import com.minelittlepony.unicopia.client.render.shader.UShaders;
@@ -79,8 +81,10 @@ public interface URenderers {
         ParticleFactoryRegistry.getInstance().register(UParticles.RAIN_DROPS, createFactory(RaindropsParticle::new));
         ParticleFactoryRegistry.getInstance().register(UParticles.HEALTH_DRAIN, createFactory(HealthDrainParticle::create));
         ParticleFactoryRegistry.getInstance().register(UParticles.FOOTPRINT, createFactory(FootprintParticle::new));
+        ParticleFactoryRegistry.getInstance().register(UParticles.SPIRAL, createFactory(SpiralParticle::new));
         ParticleFactoryRegistry.getInstance().register(UParticles.RAINBOOM_RING, RainboomParticle::new);
         ParticleFactoryRegistry.getInstance().register(UParticles.RAINBOOM_TRAIL, RainbowTrailParticle::new);
+        ParticleFactoryRegistry.getInstance().register(UParticles.WIND, WindParticle::new);
         ParticleFactoryRegistry.getInstance().register(UParticles.SHOCKWAVE, ShockwaveParticle::new);
         ParticleFactoryRegistry.getInstance().register(UParticles.SPHERE, SphereParticle::new);
         ParticleFactoryRegistry.getInstance().register(UParticles.DISK, DiskParticle::new);
@@ -112,6 +116,7 @@ public interface URenderers {
         EntityRendererRegistry.register(UEntities.TENTACLE, TentacleEntityRenderer::new);
         EntityRendererRegistry.register(UEntities.IGNOMINIOUS_BULB, IgnominiousBulbEntityRenderer::new);
         EntityRendererRegistry.register(UEntities.SPECTER, EmptyEntityRenderer::new);
+        EntityRendererRegistry.register(UEntities.MIMIC, MimicEntityRenderer::new);
 
         BlockEntityRendererFactories.register(UBlockEntities.WEATHER_VANE, WeatherVaneBlockEntityRenderer::new);
         BlockEntityRendererFactories.register(UBlockEntities.FANCY_BED, CloudBedBlockEntityRenderer::new);

src/main/java/com/minelittlepony/unicopia/client/gui/UHud.java

@@ -3,6 +3,7 @@ package com.minelittlepony.unicopia.client.gui;
 import java.util.List;
 
 import org.jetbrains.annotations.Nullable;
+import org.joml.Matrix4f;
 
 import com.minelittlepony.unicopia.*;
 import com.minelittlepony.unicopia.ability.*;
@@ -24,6 +25,8 @@ import net.minecraft.client.MinecraftClient;
 import net.minecraft.client.font.TextRenderer;
 import net.minecraft.client.gui.DrawContext;
 import net.minecraft.client.gui.hud.InGameHud;
+import net.minecraft.client.render.RenderLayer;
+import net.minecraft.client.render.VertexConsumer;
 import net.minecraft.client.util.math.MatrixStack;
 import net.minecraft.entity.player.PlayerEntity;
 import net.minecraft.item.ItemStack;
@@ -303,6 +306,34 @@ public class UHud {
             context.fill(0, 0, scaledWidth, scaledHeight, 0x00FF0000 | (alpha << 24));
             context.fillGradient(0, (int)(scaledHeight / 1.5), scaledWidth, scaledHeight, 0x00FF0000, 0xAAFF0000);
         }
+
+        if (pony.getPhysics().isFlyingSurvival) {
+            float effectStrength = (float)MathHelper.clamp(pony.getPhysics().getClientVelocity().length() / 15F, 0, 1);
+
+            VertexConsumer vertexConsumer = context.getVertexConsumers().getBuffer(RenderLayer.getGui());
+
+            float innerRadiusPulse = MathHelper.cos((pony.asEntity().age + tickDelta) / 2F) * 6 + (effectStrength * scaledHeight / 2F);
+
+            double points = 22;
+            float wedgeAngle = 0.05F + MathHelper.sin((pony.asEntity().age + tickDelta) / 3F) * 0.01F;
+            float outerRadius = Math.max(scaledWidth, scaledHeight);
+            float alpha = effectStrength * (0.6F + Math.abs(MathHelper.sin((pony.asEntity().age + tickDelta) / 10F)));
+            context.getMatrices().push();
+            context.getMatrices().translate(scaledWidth / 2F, scaledHeight / 2F, 0);
+            Matrix4f matrix4f = context.getMatrices().peek().getPositionMatrix();
+            for (int i = 0; i < points; i++) {
+                float angle = (MathHelper.TAU * i / (float)points) - wedgeAngle * 0.5F;
+                float innerRadius = Math.max(0, (scaledHeight / 2F) + (i % 2) * 72 + 14 * (1 - effectStrength) - innerRadiusPulse);
+                float centerX = MathHelper.sin(angle) * innerRadius;
+                float centerY = MathHelper.cos(angle) * innerRadius;
+
+                vertexConsumer.vertex(matrix4f, centerX, centerY, 0).color(1F, 1F, 1F, alpha * 0.3F).next();
+                vertexConsumer.vertex(matrix4f, MathHelper.sin(angle - wedgeAngle) * outerRadius, MathHelper.cos(angle - wedgeAngle) * outerRadius, 0).color(1F, 1F, 1F, alpha).next();
+                vertexConsumer.vertex(matrix4f, MathHelper.sin(angle + wedgeAngle) * outerRadius, MathHelper.cos(angle + wedgeAngle) * outerRadius, 0).color(1F, 1F, 1F, alpha).next();
+                vertexConsumer.vertex(matrix4f, centerX, centerY, 0).color(1F, 1F, 1F, alpha * 0.3F).next();
+            }
+            context.getMatrices().pop();
+        }
     }
 
     private void renderVignette(DrawContext context, int color, float alpha, float radius, int scaledWidth, int scaledHeight) {

src/main/java/com/minelittlepony/unicopia/client/particle/RainbowTrailParticle.java

@@ -29,7 +29,7 @@ public class RainbowTrailParticle extends AbstractBillboardParticle {
 
     public RainbowTrailParticle(TargetBoundParticleEffect effect, ClientWorld world, double x, double y, double z, double velocityX, double velocityY, double velocityZ) {
         super(world, x, y, z, velocityX, velocityY, velocityZ);
-        trail = new Trail(new Vec3d(x, y, z));
+        trail = new Trail(new Vec3d(x, y, z), 1);
         setMaxAge(300);
         this.velocityX = velocityX;
         this.velocityY = velocityY;

src/main/java/com/minelittlepony/unicopia/client/particle/SpiralParticle.java

@@ -0,0 +1,80 @@
+package com.minelittlepony.unicopia.client.particle;
+
+import org.jetbrains.annotations.Nullable;
+
+import com.minelittlepony.unicopia.particle.SpiralParticleEffect;
+
+import net.minecraft.client.MinecraftClient;
+import net.minecraft.client.particle.NoRenderParticle;
+import net.minecraft.client.particle.Particle;
+import net.minecraft.client.particle.SpriteProvider;
+import net.minecraft.client.world.ClientWorld;
+import net.minecraft.util.math.MathHelper;
+import net.minecraft.util.math.Vec3d;
+
+public class SpiralParticle extends NoRenderParticle {
+
+    private final SpiralParticleEffect parameters;
+
+    @Nullable
+    private final Particle particle;
+
+    private float scale;
+
+    public SpiralParticle(SpiralParticleEffect parameters, SpriteProvider provider, ClientWorld world, double x, double y, double z, double velocityX, double velocityY, double velocityZ) {
+        super(world, x, y, z, velocityX, velocityY, velocityZ);
+        this.scale = 0.1f * (random.nextFloat() * 0.5f + 0.5f) * 2.0f;
+        setMaxAge(3);
+        scale(0.125F);
+        this.parameters = parameters;
+        this.collidesWithWorld = false;
+        this.particle = MinecraftClient.getInstance().particleManager.addParticle(parameters.effect(), x, y, z, velocityX, velocityY, velocityZ);
+        this.particle.setMaxAge(1000);
+    }
+
+    @Override
+    public Particle scale(float scale) {
+        this.scale *= scale;
+        super.scale(scale);
+        return this;
+    }
+
+    @Override
+    public void move(double dx, double dy, double dz) {
+        super.move(dx, dy, dz);
+        if (particle != null) {
+            particle.setPos(x, y, z);
+        }
+    }
+
+    @Override
+    public void tick() {
+        if (particle == null || !particle.isAlive()) {
+            markDead();
+        }
+
+        super.tick();
+
+        Vec3d target = parameters.centerPoint().getPosition(world);
+        Vec3d pos = new Vec3d(x, y, z);
+
+        if (scale * 1.5F < 0.5F) {
+            scale(1.5F);
+        }
+
+        double distance = pos.distanceTo(target);
+        if (distance > 0) {
+            age = 0;
+        }
+
+        Vec3d radial = target.subtract(pos).normalize();
+        Vec3d tangent = radial.rotateY(MathHelper.HALF_PI).multiply(parameters.angularVelocity() * 0.9F);
+        Vec3d motion = radial.multiply(parameters.angularVelocity() * 0.1F).add(tangent);
+        move(motion.x, motion.y, motion.z);
+    }
+
+    @Override
+    public String toString() {
+        return super.toString() + ", Angular Velocity " + parameters.angularVelocity() + ", Target (" + parameters.centerPoint() + ") Sub-Particle (" + particle + ")";
+    }
+}

src/main/java/com/minelittlepony/unicopia/client/particle/WindParticle.java

@@ -0,0 +1,104 @@
+package com.minelittlepony.unicopia.client.particle;
+
+import java.util.List;
+import org.jetbrains.annotations.Nullable;
+
+import com.minelittlepony.unicopia.Unicopia;
+import com.minelittlepony.unicopia.client.render.bezier.BezierSegment;
+import com.minelittlepony.unicopia.client.render.bezier.Trail;
+import com.minelittlepony.unicopia.particle.TargetBoundParticleEffect;
+
+import net.minecraft.client.MinecraftClient;
+import net.minecraft.client.render.BufferBuilder;
+import net.minecraft.client.render.Tessellator;
+import net.minecraft.client.world.ClientWorld;
+import net.minecraft.entity.Entity;
+import net.minecraft.util.Identifier;
+import net.minecraft.util.math.MathHelper;
+import net.minecraft.util.math.Vec3d;
+
+public class WindParticle extends AbstractBillboardParticle {
+    private static final Identifier TEXTURE = Unicopia.id("textures/particle/wind.png");
+
+    private final Trail trail;
+
+    @Nullable
+    private Entity target;
+
+    private int attachmentTicks;
+
+    private final Vec3d offset;
+    private final boolean passive;
+
+    public WindParticle(TargetBoundParticleEffect effect, ClientWorld world, double x, double y, double z, double velocityX, double velocityY, double velocityZ) {
+        super(world, x, y, z, velocityX, velocityY, velocityZ);
+        trail = new Trail(new Vec3d(x, y, z), 0.02F);
+        setMaxAge(300);
+        this.alpha = 0.15F;
+        this.velocityX = velocityX;
+        this.velocityY = velocityY;
+        this.velocityZ = velocityZ;
+        this.attachmentTicks = (int)world.random.nextTriangular(15, 12);
+        this.passive = effect.getTargetId() <= 0;
+        this.collidesWithWorld = false;
+
+        if (effect.getTargetId() > 0) {
+            this.target = world.getEntityById(effect.getTargetId());
+        }
+        offset = target == null ? Vec3d.ZERO : new Vec3d(x, y, z).subtract(target.getPos());
+    }
+
+    @Override
+    protected Identifier getTexture() {
+        return TEXTURE;
+    }
+
+    @Override
+    public boolean isAlive() {
+        return age < getMaxAge() && (!dead || !trail.getSegments().isEmpty());
+    }
+
+    @Override
+    protected void renderQuads(Tessellator te, BufferBuilder buffer, float x, float y, float z, float tickDelta) {
+        float alpha = this.alpha * (1 - (float)age / maxAge);
+
+        List<Trail.Segment> segments = trail.getSegments();
+
+        for (int i = 0; i < segments.size() - 1; i++) {
+            BezierSegment corners = segments.get(i).getPlane(segments.get(i + 1));
+            float scale = getScale(tickDelta);
+
+            corners.forEachCorner(corner -> {
+                corner.position().mul(scale).add(x, y, z);
+            });
+
+            renderQuad(te, buffer, corners.corners(), segments.get(i).getAlpha() * alpha, tickDelta);
+        }
+    }
+
+    @Override
+    public void tick() {
+        super.tick();
+
+        float animationFrame = age + MinecraftClient.getInstance().getTickDelta();
+
+        float sin = MathHelper.sin(animationFrame / 5F) * 0.1F;
+        float cos = MathHelper.cos(animationFrame / 10F) * 0.2F;
+
+        if (passive) {
+            trail.update(new Vec3d(x + cos, y + sin, z - cos));
+        } else {
+            if (target != null && target.isAlive()) {
+                trail.update(target.getPos().add(offset).add(cos, sin, -cos));
+
+                if (attachmentTicks > 0 && --attachmentTicks <= 0) {
+                    target = null;
+                }
+            }
+        }
+
+        if (trail.tick()) {
+            markDead();
+        }
+    }
+}

src/main/java/com/minelittlepony/unicopia/client/render/EntityDisguiseRenderer.java

@@ -7,7 +7,8 @@ import com.minelittlepony.unicopia.compat.pehkui.PehkUtil;
 import com.minelittlepony.unicopia.entity.Living;
 import com.minelittlepony.unicopia.entity.behaviour.Disguise;
 import com.minelittlepony.unicopia.entity.behaviour.EntityAppearance;
-import com.minelittlepony.unicopia.entity.behaviour.FallingBlockBehaviour;
+import com.minelittlepony.unicopia.mixin.MixinBlockEntity;
+
 import net.minecraft.block.BlockState;
 import net.minecraft.block.entity.BlockEntity;
 import net.minecraft.client.MinecraftClient;
@@ -86,7 +87,7 @@ class EntityDisguiseRenderer {
         if (blockEntity != null) {
             BlockEntityRenderer<BlockEntity> r = MinecraftClient.getInstance().getBlockEntityRenderDispatcher().get(blockEntity);
             if (r != null) {
-                ((FallingBlockBehaviour.Positioned)blockEntity).setPos(e.getBlockPos());
+                ((MixinBlockEntity)blockEntity).setPos(e.getBlockPos());
                 blockEntity.setWorld(e.getWorld());
                 matrices.push();
 

src/main/java/com/minelittlepony/unicopia/client/render/bezier/Trail.java

@@ -12,8 +12,11 @@ public class Trail {
 
     public final Vec3d pos;
 
-    public Trail(Vec3d pos) {
+    private final float height;
+
+    public Trail(Vec3d pos, float height) {
         this.pos = pos;
+        this.height = height;
         segments.add(new Segment(pos));
     }
 
@@ -61,7 +64,7 @@ public class Trail {
         }
 
         public BezierSegment getPlane(Segment to) {
-            return new BezierSegment(offset, to.offset, 1);
+            return new BezierSegment(offset, to.offset, height);
         }
     }
 }

src/main/java/com/minelittlepony/unicopia/client/render/entity/CloudChestBlockEntityRenderer.java

@@ -59,7 +59,7 @@ public class CloudChestBlockEntityRenderer extends ChestBlockEntityRenderer<Ches
         matrices.pop();
     }
 
-    private DoubleBlockProperties.PropertySource<? extends ChestBlockEntity> getProperties(BlockState state, ChestBlockEntity entity) {
+    public static DoubleBlockProperties.PropertySource<? extends ChestBlockEntity> getProperties(BlockState state, ChestBlockEntity entity) {
         return entity.getWorld() != null
                 ? ((AbstractChestBlock<?>)state.getBlock()).getBlockEntitySource(state, entity.getWorld(), entity.getPos(), true)
                 : DoubleBlockProperties.PropertyRetriever::getFallback;

src/main/java/com/minelittlepony/unicopia/client/render/entity/CrystalShardsEntityRenderer.java

@@ -9,10 +9,8 @@ import net.minecraft.client.render.OverlayTexture;
 import net.minecraft.client.render.VertexConsumerProvider;
 import net.minecraft.client.render.entity.EntityRenderer;
 import net.minecraft.client.render.entity.EntityRendererFactory;
-import net.minecraft.client.render.model.ModelLoader;
 import net.minecraft.client.util.math.MatrixStack;
 import net.minecraft.util.Identifier;
-import net.minecraft.util.math.MathHelper;
 import net.minecraft.util.math.RotationAxis;
 
 public class CrystalShardsEntityRenderer extends EntityRenderer<CrystalShardsEntity> {
@@ -30,6 +28,8 @@ public class CrystalShardsEntityRenderer extends EntityRenderer<CrystalShardsEnt
 
     @Override
     public void render(CrystalShardsEntity entity, float yaw, float tickDelta, MatrixStack matrices, VertexConsumerProvider vertices, int light) {
+        vertices = FloatingArtefactEntityRenderer.getDestructionOverlayProvider(matrices, vertices, 4, FloatingArtefactEntityRenderer.getDestructionStage(entity));
+
         matrices.push();
         matrices.multiply(entity.getAttachmentFace().getRotationQuaternion());
         matrices.scale(-1, -1, 1);
@@ -39,11 +39,6 @@ public class CrystalShardsEntityRenderer extends EntityRenderer<CrystalShardsEnt
         matrices.multiply(RotationAxis.POSITIVE_Y.rotationDegrees(yaw));
 
         model.setAngles(entity, 0, 0, 0, 0, 0);
-
-        int destructionStage = (int)(MathHelper.clamp(1F - (entity.getHealth() / entity.getMaxHealth()), 0F, 1F) * (ModelLoader.field_32983 - 1F));
-
-        vertices = FloatingArtefactEntityRenderer.getDestructionOverlayProvider(matrices, vertices, destructionStage);
-
         model.render(matrices, vertices.getBuffer(model.getLayer(getTexture(entity))), light, OverlayTexture.DEFAULT_UV, 1, 1, 1, 1);
         matrices.pop();
         super.render(entity, yaw, tickDelta, matrices, vertices, light);

src/main/java/com/minelittlepony/unicopia/client/render/entity/FloatingArtefactEntityRenderer.java

@@ -2,6 +2,7 @@ package com.minelittlepony.unicopia.client.render.entity;
 
 import com.minelittlepony.unicopia.client.render.RenderLayers;
 import com.minelittlepony.unicopia.entity.mob.FloatingArtefactEntity;
+import com.minelittlepony.unicopia.entity.mob.StationaryObjectEntity;
 import com.minelittlepony.unicopia.item.UItems;
 import net.minecraft.client.MinecraftClient;
 import net.minecraft.client.render.OverlayTexture;
@@ -15,6 +16,7 @@ import net.minecraft.client.render.model.BakedModel;
 import net.minecraft.client.render.model.ModelLoader;
 import net.minecraft.client.render.model.json.ModelTransformationMode;
 import net.minecraft.client.util.math.MatrixStack;
+import net.minecraft.entity.LivingEntity;
 import net.minecraft.item.ItemStack;
 import net.minecraft.screen.PlayerScreenHandler;
 import net.minecraft.util.Identifier;
@@ -52,9 +54,7 @@ public class FloatingArtefactEntityRenderer extends EntityRenderer<FloatingArtef
         matrices.translate(0, verticalOffset + variance * modelScaleY, 0);
         matrices.multiply(RotationAxis.POSITIVE_Y.rotationDegrees(entity.getRotation(timeDelta)));
 
-        int destructionStage = (int)(MathHelper.clamp(1F - (entity.getHealth() / entity.getMaxHealth()), 0F, 1F) * (ModelLoader.field_32983 - 1F));
+        itemRenderer.renderItem(stack, ModelTransformationMode.GROUND, false, matrices, getDestructionOverlayProvider(matrices, vertices, 4F, getDestructionStage(entity)), lightUv, OverlayTexture.DEFAULT_UV, model);
-
-        itemRenderer.renderItem(stack, ModelTransformationMode.GROUND, false, matrices, getDestructionOverlayProvider(matrices, vertices, destructionStage), lightUv, OverlayTexture.DEFAULT_UV, model);
 
         matrices.pop();
 
@@ -66,16 +66,24 @@ public class FloatingArtefactEntityRenderer extends EntityRenderer<FloatingArtef
         return PlayerScreenHandler.BLOCK_ATLAS_TEXTURE;
     }
 
-    static VertexConsumerProvider getDestructionOverlayProvider(MatrixStack matrices, VertexConsumerProvider vertices, int stage) {
+    static int getDestructionStage(StationaryObjectEntity entity) {
+        return (int)(MathHelper.clamp(1F - (entity.getHealth() / entity.getMaxHealth()), 0F, 1F) * (ModelLoader.field_32983 - 1F));
+    }
+
+    static int getDestructionStage(LivingEntity entity) {
+        return (int)(MathHelper.clamp(1F - (entity.getHealth() / entity.getMaxHealth()), 0F, 1F) * (ModelLoader.field_32983 - 1F));
+    }
+
+    static VertexConsumerProvider getDestructionOverlayProvider(MatrixStack matrices, VertexConsumerProvider vertices, float scale, int stage) {
         if (stage <= 0) {
             return vertices;
         }
         final MatrixStack.Entry entry = matrices.peek();
         final OverlayVertexConsumer destructionOverlay = new OverlayVertexConsumer(
-                MinecraftClient.getInstance().getBufferBuilders().getEffectVertexConsumers().getBuffer(RenderLayers.getCrumbling(stage)),
+                MinecraftClient.getInstance().getBufferBuilders().getEffectVertexConsumers().getBuffer(RenderLayers.getCrumbling(MathHelper.clamp(stage, 0, ModelLoader.field_32983 - 1))),
                 entry.getPositionMatrix(),
                 entry.getNormalMatrix(),
-                4F
+                scale
         );
         return layer -> layer.hasCrumbling() ? VertexConsumers.union(destructionOverlay, vertices.getBuffer(layer)) : vertices.getBuffer(layer);
     }

src/main/java/com/minelittlepony/unicopia/client/render/entity/MimicEntityRenderer.java

@@ -0,0 +1,166 @@
+package com.minelittlepony.unicopia.client.render.entity;
+
+import com.minelittlepony.unicopia.entity.mob.MimicEntity;
+
+import net.minecraft.block.ChestBlock;
+import net.minecraft.block.entity.BlockEntity;
+import net.minecraft.block.entity.ChestBlockEntity;
+import net.minecraft.client.MinecraftClient;
+import net.minecraft.client.model.Dilation;
+import net.minecraft.client.model.ModelData;
+import net.minecraft.client.model.ModelPart;
+import net.minecraft.client.model.ModelPartBuilder;
+import net.minecraft.client.model.ModelPartData;
+import net.minecraft.client.model.ModelTransform;
+import net.minecraft.client.model.TexturedModelData;
+import net.minecraft.client.render.VertexConsumer;
+import net.minecraft.client.render.VertexConsumerProvider;
+import net.minecraft.client.render.entity.*;
+import net.minecraft.client.render.entity.feature.FeatureRenderer;
+import net.minecraft.client.render.entity.feature.FeatureRendererContext;
+import net.minecraft.client.render.entity.model.EntityModel;
+import net.minecraft.client.util.math.MatrixStack;
+import net.minecraft.util.Identifier;
+import net.minecraft.util.math.MathHelper;
+import net.minecraft.util.math.RotationAxis;
+
+public class MimicEntityRenderer extends MobEntityRenderer<MimicEntity, MimicEntityRenderer.MimicModel> {
+    private static final Identifier TEXTURE = new Identifier("textures/entity/chest/normal.png");
+
+    public MimicEntityRenderer(EntityRendererFactory.Context context) {
+        super(context, new MimicModel(MimicModel.getTexturedModelData().createModel()), 0);
+        addFeature(new ChestFeature(this));
+    }
+
+    @Override
+    public void render(MimicEntity entity, float yaw, float tickDelta, MatrixStack matrices, VertexConsumerProvider vertices, int light) {
+        matrices.push();
+        matrices.translate(0, 0.3F * entity.getPeekAmount(), 0);
+
+        float legAngle = entity.limbAnimator.getPos(tickDelta);
+        float legSpeed = entity.limbAnimator.getSpeed(tickDelta);
+
+        matrices.multiply(RotationAxis.POSITIVE_X.rotationDegrees(MathHelper.cos(legAngle * 0.6662F) * 1.4F * legSpeed * 10 * entity.getPeekAmount()));
+        super.render(entity, yaw, tickDelta, matrices,
+            FloatingArtefactEntityRenderer.getDestructionOverlayProvider(
+                    matrices,
+                    vertices,
+                    1,
+                    FloatingArtefactEntityRenderer.getDestructionStage(entity)
+        ), light);
+        matrices.pop();
+    }
+
+    @Override
+    public Identifier getTexture(MimicEntity entity) {
+        return TEXTURE;
+    }
+
+    @Override
+    protected float getLyingAngle(MimicEntity entity) {
+        return 0;
+    }
+
+    static class ChestFeature extends FeatureRenderer<MimicEntity, MimicModel> {
+        public ChestFeature(FeatureRendererContext<MimicEntity, MimicModel> context) {
+            super(context);
+        }
+
+        @Override
+        public void render(MatrixStack matrices, VertexConsumerProvider vertexConsumers, int light, MimicEntity entity, float limbAngle, float limbDistance, float tickDelta, float animationProgress, float headYaw, float headPitch) {
+            BlockEntity tileData = entity.getChestData();
+            if (tileData != null) {
+                matrices.multiply(RotationAxis.POSITIVE_Z.rotationDegrees(180));
+                matrices.multiply(RotationAxis.POSITIVE_X.rotationDegrees(-entity.getPitch(tickDelta)));
+                matrices.push();
+                matrices.translate(-0.5, -1.5, -0.5);
+                MinecraftClient.getInstance().getBlockEntityRenderDispatcher().render(tileData, tickDelta, matrices, vertexConsumers);
+                matrices.pop();
+            }
+        }
+
+    }
+
+    static class MimicModel extends EntityModel<MimicEntity> {
+        private ModelPart part;
+        private ModelPart lid;
+        private ModelPart leftLeg;
+        private ModelPart rightLeg;
+
+        public MimicModel(ModelPart part) {
+            this.part = part;
+            this.lid = part.getChild("lid");
+            this.leftLeg = part.getChild("left_leg");
+            this.rightLeg = part.getChild("right_leg");
+        }
+
+        public static TexturedModelData getTexturedModelData() {
+            ModelData data = new ModelData();
+            ModelPartData root = data.getRoot();
+            ModelPartData lid = root.addChild("lid", ModelPartBuilder.create(), ModelTransform.of(0, 15, -7, 0, 0, -3.1416F));
+            lid.addChild("tongue", ModelPartBuilder.create()
+                    .uv(11, 34).cuboid(-3, -11, 1, 6, 1, 8, Dilation.NONE), ModelTransform.of(0, 6, 9, 0.8F, 0, 0));
+            lid.addChild("upper_teeth", ModelPartBuilder.create()
+                    //.uv(0, 0).cuboid(-7, 0, 0, 14, 5, 14, Dilation.NONE)
+                    .uv(0, 0).cuboid(-1, -2, 12, 2, 4, 1, Dilation.NONE)
+                    .uv(0, 0).cuboid(-4, -2, 12, 2, 4, 1, Dilation.NONE)
+                    .uv(0, 0).cuboid(2, -2, 12, 2, 4, 1, Dilation.NONE), ModelTransform.NONE)
+                    .addChild("cube_r1", ModelPartBuilder.create()
+                        .uv(0, 0).cuboid(-5, -2, -6, 2, 4, 1, Dilation.NONE)
+                        .uv(0, 0).cuboid(-8, -2, -6, 2, 4, 1, Dilation.NONE)
+                        .uv(0, 0).cuboid(-11, -2, -6, 2, 4, 1, Dilation.NONE)
+                        .uv(0, 0).cuboid(-5, -2, 5, 2, 4, 1, Dilation.NONE)
+                        .uv(0, 0).cuboid(-8, -2, 5, 2, 4, 1, Dilation.NONE)
+                        .uv(0, 0).cuboid(-11, -2, 5, 2, 4, 1, Dilation.NONE), ModelTransform.of(0, 0, 0, 0, 1.5708F, 0));
+            root.addChild("lower_teeth", ModelPartBuilder.create()
+                .uv(0, 0).cuboid(-1, -1, 12, 2, 4, 1, Dilation.NONE)
+                .uv(0, 0).cuboid(-4, -1, 12, 2, 4, 1, Dilation.NONE)
+                .uv(0, 0).cuboid(2, -1, 12, 2, 4, 1, Dilation.NONE), ModelTransform.pivot(0, 13, -7))
+                .addChild("cube_r2", ModelPartBuilder.create()
+                    .uv(0, 0).cuboid(-6, -1, -6, 2, 4, 1, Dilation.NONE)
+                    .uv(0, 0).cuboid(-9, -1, -6, 2, 4, 1, Dilation.NONE)
+                    .uv(0, 0).cuboid(-12, -1, -6, 2, 4, 1, Dilation.NONE)
+                    .uv(0, 0).cuboid(-6, -1, 5, 2, 4, 1, Dilation.NONE)
+                    .uv(0, 0).cuboid(-9, -1, 5, 2, 4, 1, Dilation.NONE)
+                    .uv(0, 0).cuboid(-12, -1, 5, 2, 4, 1, Dilation.NONE), ModelTransform.of(0, 0, 0, 0, 1.5708F, 0));
+            root.addChild("right_leg", ModelPartBuilder.create()
+                    .uv(7, 30).cuboid(-2.5F, -1.5F, -3.5F, 5, 7, 6, Dilation.NONE), ModelTransform.pivot(3.5F, 23.5F, 0));
+            root.addChild("left_leg", ModelPartBuilder.create()
+                    .uv(7, 30).mirrored().cuboid(-9.5F, -1.5F, -3.5F, 5, 7, 6, Dilation.NONE), ModelTransform.pivot(3.5F, 23.5F, 0));
+            return TexturedModelData.of(data, 64, 64);
+        }
+
+        @Override
+        public void animateModel(MimicEntity entity, float limbAngle, float limbDistance, float tickDelta) {
+            ChestBlockEntity tileData = entity.getChestData();
+            if (tileData != null) {
+                var properties = CloudChestBlockEntityRenderer.getProperties(tileData.getCachedState(), tileData);
+                float progress = 1 - (float)Math.pow(1 - properties.apply(ChestBlock.getAnimationProgressRetriever(tileData)).get(tickDelta), 3);
+                lid.pitch = -(progress * 1.5707964f);
+            } else {
+                lid.pitch = 0;
+            }
+            part.yaw = MathHelper.RADIANS_PER_DEGREE * 180;
+            part.pitch = -entity.getPitch(tickDelta) * MathHelper.RADIANS_PER_DEGREE;
+        }
+
+        @Override
+        public void setAngles(MimicEntity entity, float limbAngle, float limbDistance, float animationProgress, float headYaw, float headPitch) {
+            rightLeg.resetTransform();
+            leftLeg.resetTransform();
+            rightLeg.pitch = MathHelper.cos(limbAngle * 0.6662F) * 1.4F * limbDistance;
+            leftLeg.pitch = MathHelper.cos(limbAngle * 0.6662F + (float) Math.PI) * 1.4F * limbDistance;
+            float revealPercentage = entity.getPeekAmount();
+            float velocy = (1 - revealPercentage) * -10F;
+            rightLeg.pivotY += velocy;
+            leftLeg.pivotY += velocy;
+            rightLeg.visible = revealPercentage > 0.2F;
+            leftLeg.visible = revealPercentage > 0.2F;
+        }
+
+        @Override
+        public void render(MatrixStack matrices, VertexConsumer vertices, int light, int overlay, float red, float green, float blue, float alpha) {
+            part.render(matrices, vertices, light, overlay);
+        }
+    }
+}

src/main/java/com/minelittlepony/unicopia/datagen/providers/tag/UBlockTagProvider.java

@@ -81,6 +81,10 @@ public class UBlockTagProvider extends FabricTagProvider.BlockTagProvider {
             .forceAddTag(UTags.Blocks.JARS)
             .add(Blocks.VINE, Blocks.LILY_PAD);
 
+        getOrCreateTagBuilder(UTags.Blocks.MIMIC_CHESTS).add(
+                Blocks.CHEST, Blocks.TRAPPED_CHEST, UBlocks.CLOUD_CHEST
+        );
+
         getOrCreateTagBuilder(UTags.Blocks.INTERESTING).add(
                 Blocks.SEA_LANTERN, Blocks.ENDER_CHEST, Blocks.END_PORTAL_FRAME,
                 Blocks.JUKEBOX, Blocks.SPAWNER

src/main/java/com/minelittlepony/unicopia/entity/behaviour/FallingBlockBehaviour.java

@@ -6,6 +6,7 @@ import java.util.Optional;
 import com.minelittlepony.unicopia.ability.magic.Caster;
 import com.minelittlepony.unicopia.entity.Living;
 import com.minelittlepony.unicopia.entity.player.Pony;
+import com.minelittlepony.unicopia.mixin.MixinBlockEntity;
 import com.minelittlepony.unicopia.mixin.MixinFallingBlock;
 import com.minelittlepony.unicopia.mixin.MixinFallingBlockEntity;
 import com.minelittlepony.unicopia.util.Tickable;
@@ -25,7 +26,6 @@ import net.minecraft.entity.FallingBlockEntity;
 import net.minecraft.entity.damage.DamageSource;
 import net.minecraft.state.property.Properties;
 import net.minecraft.registry.tag.BlockTags;
-import net.minecraft.util.math.BlockPos;
 import net.minecraft.util.math.Direction;
 import net.minecraft.util.math.Vec3d;
 
@@ -118,13 +118,9 @@ public class FallingBlockBehaviour extends EntityBehaviour<FallingBlockEntity> {
             }
 
             be.setWorld(entity.getWorld());
-            ((Positioned)be).setPos(entity.getBlockPos());
+            ((MixinBlockEntity)be).setPos(entity.getBlockPos());
             ceb.tick();
             be.setWorld(null);
         }
     }
-
-    public interface Positioned {
-        void setPos(BlockPos pos);
-    }
 }

src/main/java/com/minelittlepony/unicopia/entity/mob/MimicEntity.java

@@ -0,0 +1,403 @@
+package com.minelittlepony.unicopia.entity.mob;
+
+import java.util.HashSet;
+import java.util.Set;
+
+import org.jetbrains.annotations.Nullable;
+
+import com.minelittlepony.unicopia.UTags;
+import com.minelittlepony.unicopia.item.enchantment.EnchantmentUtil;
+import com.minelittlepony.unicopia.mixin.MixinBlockEntity;
+import com.minelittlepony.unicopia.util.InventoryUtil;
+
+import net.minecraft.block.BlockState;
+import net.minecraft.block.Blocks;
+import net.minecraft.block.ChestBlock;
+import net.minecraft.block.entity.BlockEntity;
+import net.minecraft.block.entity.ChestBlockEntity;
+import net.minecraft.block.enums.ChestType;
+import net.minecraft.entity.EntityType;
+import net.minecraft.entity.LivingEntity;
+import net.minecraft.entity.ai.goal.MeleeAttackGoal;
+import net.minecraft.entity.damage.DamageSource;
+import net.minecraft.entity.data.DataTracker;
+import net.minecraft.entity.data.TrackedData;
+import net.minecraft.entity.data.TrackedDataHandlerRegistry;
+import net.minecraft.entity.mob.PathAwareEntity;
+import net.minecraft.entity.player.PlayerEntity;
+import net.minecraft.entity.player.PlayerInventory;
+import net.minecraft.inventory.SimpleInventory;
+import net.minecraft.item.Item;
+import net.minecraft.item.ItemStack;
+import net.minecraft.item.Items;
+import net.minecraft.loot.LootTables;
+import net.minecraft.nbt.NbtCompound;
+import net.minecraft.nbt.NbtElement;
+import net.minecraft.nbt.NbtOps;
+import net.minecraft.screen.GenericContainerScreenHandler;
+import net.minecraft.screen.NamedScreenHandlerFactory;
+import net.minecraft.screen.ScreenHandler;
+import net.minecraft.server.network.ServerPlayerEntity;
+import net.minecraft.sound.SoundEvents;
+import net.minecraft.text.Text;
+import net.minecraft.util.ActionResult;
+import net.minecraft.util.Hand;
+import net.minecraft.util.Identifier;
+import net.minecraft.util.ItemScatterer;
+import net.minecraft.util.math.BlockPos;
+import net.minecraft.util.math.Direction;
+import net.minecraft.util.math.MathHelper;
+import net.minecraft.world.World;
+
+public class MimicEntity extends PathAwareEntity {
+    static final byte OPEN_MOUTH = (byte)200;
+    static final byte CLOSE_MOUTH = (byte)201;
+    static final TrackedData<NbtCompound> CHEST_DATA = DataTracker.registerData(MimicEntity.class, TrackedDataHandlerRegistry.NBT_COMPOUND);
+    static final TrackedData<Boolean> MOUTH_OPEN = DataTracker.registerData(MimicEntity.class, TrackedDataHandlerRegistry.BOOLEAN);
+
+    @Nullable
+    private ChestBlockEntity chestData;
+
+    private int openTicks;
+    private final Set<PlayerEntity> observingPlayers = new HashSet<>();
+
+    public static boolean shouldConvert(World world, BlockPos pos, PlayerEntity player, Identifier lootTable) {
+        if (!shouldGenerateMimic(lootTable)
+                || !world.getBlockState(pos).isIn(UTags.Blocks.MIMIC_CHESTS)
+                || !(world.getBlockEntity(pos) instanceof ChestBlockEntity be)
+                || be.getCachedState().getOrEmpty(ChestBlock.CHEST_TYPE).orElse(ChestType.SINGLE) != ChestType.SINGLE) {
+            return false;
+        }
+
+        int difficulty = world.getDifficulty().ordinal() - 1;
+        float threshold = 0.35F * ((EnchantmentUtil.getLuck(0, player) / 20F) + 0.5F);
+        return difficulty > 0 && world.random.nextFloat() < (difficulty / 3F) * threshold;
+    }
+
+    @SuppressWarnings("deprecation")
+    @Nullable
+    public static MimicEntity spawnFromChest(World world, BlockPos pos) {
+        if (!(world.getBlockEntity(pos) instanceof ChestBlockEntity be)) {
+            return null;
+        }
+        world.removeBlockEntity(pos);
+        world.setBlockState(pos, Blocks.AIR.getDefaultState());
+        MimicEntity mimic = UEntities.MIMIC.create(world);
+        BlockState state = be.getCachedState();
+        Direction facing = state.getOrEmpty(ChestBlock.FACING).orElse(null);
+        float yaw = facing.asRotation();
+        be.setCachedState(be.getCachedState().getBlock().getDefaultState());
+        mimic.updatePositionAndAngles(pos.getX() + 0.5, pos.getY(), pos.getZ() + 0.5, yaw, 0);
+        mimic.setHeadYaw(yaw);
+        mimic.setBodyYaw(yaw);
+        mimic.setYaw(yaw);
+        mimic.setChest(be);
+        world.spawnEntity(mimic);
+        return mimic;
+    }
+
+    public static boolean shouldGenerateMimic(@Nullable Identifier lootTable) {
+        return lootTable != null
+             && lootTable.getPath().indexOf("village") == -1
+             && lootTable.getPath().indexOf("bastion") == -1
+             && lootTable.getPath().indexOf("underwater") == -1
+             && lootTable.getPath().indexOf("shipwreck") == -1;
+    }
+
+    MimicEntity(EntityType<? extends MimicEntity> type, World world) {
+        super(type, world);
+        ignoreCameraFrustum = true;
+    }
+
+    @Override
+    protected void initDataTracker() {
+        super.initDataTracker();
+        dataTracker.startTracking(CHEST_DATA, new NbtCompound());
+        dataTracker.startTracking(MOUTH_OPEN, false);
+    }
+
+    @Override
+    public boolean isCollidable() {
+        return isAlive();
+    }
+
+    @Override
+    public boolean canBreatheInWater() {
+        return true;
+    }
+
+    @Nullable
+    @Override
+    public ItemStack getPickBlockStack() {
+        Item item = chestData.getCachedState().getBlock().asItem();
+        return item == Items.AIR ? null : item.getDefaultStack();
+    }
+
+    @Override
+    protected void initGoals() {
+        goalSelector.add(2, new AttackGoal(this, 0.6F, false));
+    }
+
+    public void setChest(ChestBlock chest) {
+        if (chest.createBlockEntity(getBlockPos(), chest.getDefaultState()) instanceof ChestBlockEntity be) {
+            setChest(be);
+            be.setLootTable(LootTables.ABANDONED_MINESHAFT_CHEST, getWorld().getRandom().nextLong());
+            if (!getWorld().isClient) {
+                dataTracker.set(CHEST_DATA, writeChestData(chestData));
+            }
+        }
+    }
+
+    public void setChest(ChestBlockEntity chestData) {
+        this.chestData = chestData;
+        ((MimicGeneratable)chestData).setAllowMimics(false);
+        chestData.setWorld(getWorld());
+        if (!getWorld().isClient) {
+            dataTracker.set(CHEST_DATA, writeChestData(chestData));
+        }
+    }
+
+    @Nullable
+    public ChestBlockEntity getChestData() {
+        return chestData;
+    }
+
+    public boolean isMouthOpen() {
+        return dataTracker.get(MOUTH_OPEN);
+    }
+
+    public void setMouthOpen(boolean mouthOpen) {
+        if (mouthOpen == isMouthOpen()) {
+            return;
+        }
+
+        playSound(mouthOpen ? SoundEvents.BLOCK_CHEST_OPEN : SoundEvents.BLOCK_CHEST_CLOSE, 0.5F, 1F);
+        dataTracker.set(MOUTH_OPEN, mouthOpen);
+        if (chestData != null) {
+            chestData.onSyncedBlockEvent(1, mouthOpen ? 1 : 0);
+        }
+    }
+
+    public void playChompAnimation() {
+        openTicks = 5;
+        setMouthOpen(true);
+    }
+
+    public float getPeekAmount() {
+        return MathHelper.clamp((float)getVelocity().lengthSquared() * 50F, 0, 1);
+    }
+
+    @Override
+    public void tick() {
+        super.tick();
+
+        if (!getWorld().isClient) {
+            if (age < 12 || (getTarget() == null && this.lastAttackedTicks < age - 30)) {
+                BlockPos pos = getBlockPos();
+                setPosition(
+                        pos.getX() + 0.5,
+                        getY(),
+                        pos.getZ() + 0.5
+                );
+                setBodyYaw(MathHelper.floor(getBodyYaw() / 90) * 90);
+                setYaw(MathHelper.floor(getYaw() / 90) * 90);
+                setHeadYaw(MathHelper.floor(getHeadYaw() / 90) * 90);
+                if (getHealth() < getMaxHealth() && getWorld().random.nextInt(20) == 0) {
+                    heal(1);
+                } else if (age % 150 == 0 && chestData != null && !isMouthOpen()) {
+                    if (getWorld().getClosestPlayer(this, 15) == null) {
+                        getWorld().setBlockState(getBlockPos(), chestData.getCachedState().withIfExists(ChestBlock.FACING, getHorizontalFacing()));
+                        if (getWorld().getBlockEntity(getBlockPos()) instanceof ChestBlockEntity be) {
+                            InventoryUtil.copyInto(chestData, be);
+                            ((MimicGeneratable)be).setMimic(true);
+                            discard();
+                        }
+                    }
+                }
+            }
+
+            if (!observingPlayers.isEmpty()) {
+                setMouthOpen(true);
+            }
+        }
+
+        if (chestData == null) {
+            setChest((ChestBlock)Blocks.CHEST);
+        }
+
+        if (getWorld().isClient) {
+            ((MixinBlockEntity)chestData).setPos(getBlockPos());
+            ChestBlockEntity.clientTick(getWorld(), getBlockPos(), chestData.getCachedState(), chestData);
+        }
+
+        if (openTicks > 0 && --openTicks <= 0) {
+            setMouthOpen(false);
+        }
+
+        if (getTarget() != null) {
+            if (openTicks <= 0 && age % 20 == 0) {
+                playChompAnimation();
+            }
+        }
+    }
+
+    @Override
+    protected ActionResult interactMob(PlayerEntity player, Hand hand) {
+        if (getTarget() == null && chestData != null) {
+            player.openHandledScreen(new NamedScreenHandlerFactory() {
+                @Override
+                public Text getDisplayName() {
+                    return chestData.getDisplayName();
+                }
+
+                @Override
+                public ScreenHandler createMenu(int syncId, PlayerInventory inv, PlayerEntity player) {
+                    return createScreenHandler(syncId, inv, player);
+                }
+            });
+
+            return ActionResult.SUCCESS;
+        }
+        return ActionResult.PASS;
+    }
+
+    public ScreenHandler createScreenHandler(int syncId, PlayerInventory inv, PlayerEntity player) {
+        chestData.checkLootInteraction(player);
+        setChest(chestData);
+        var inventory = InventoryUtil.copyInto(chestData, new SimpleInventory(chestData.size()) {
+            @Override
+            public void onOpen(PlayerEntity player) {
+                observingPlayers.add(player);
+                //setMouthOpen(true);
+            }
+
+            @Override
+            public void onClose(PlayerEntity player) {
+                observingPlayers.remove(player);
+                setMouthOpen(!observingPlayers.isEmpty());
+            }
+        });
+        inventory.addListener(sender -> {
+            if (InventoryUtil.contentEquals(inventory, chestData)) {
+                return;
+            }
+            observingPlayers.clear();
+            playChompAnimation();
+            setTarget(player);
+            if (player instanceof ServerPlayerEntity spe) {
+                spe.closeHandledScreen();
+            }
+        });
+        return GenericContainerScreenHandler.createGeneric9x3(syncId, inv, inventory);
+    }
+
+    @Override
+    public void setAttacking(boolean attacking) {
+        super.setAttacking(attacking);
+        if (attacking) {
+            playChompAnimation();
+        }
+    }
+
+    @Override
+    protected void playHurtSound(DamageSource source) {
+        playChompAnimation();
+        if (source.getAttacker()  instanceof LivingEntity l) {
+            setTarget(l);
+        }
+    }
+
+    @Override
+    public void onTrackedDataSet(TrackedData<?> data) {
+        super.onTrackedDataSet(data);
+        if (CHEST_DATA.equals(data) && getWorld().isClient) {
+            setChest(readChestData(dataTracker.get(CHEST_DATA)));
+        } else if (MOUTH_OPEN.equals(data)) {
+            if (chestData != null) {
+                chestData.onSyncedBlockEvent(1, isMouthOpen() ? 1 : 0);
+            }
+        }
+    }
+
+    @Override
+    public void readCustomDataFromNbt(NbtCompound nbt) {
+        super.readCustomDataFromNbt(nbt);
+        if (nbt.contains("chest", NbtElement.COMPOUND_TYPE)) {
+            chestData = readChestData(nbt.getCompound("chest"));
+        } else {
+            chestData = null;
+        }
+    }
+
+    @Nullable
+    private ChestBlockEntity readChestData(NbtCompound nbt) {
+        BlockState state = BlockState.CODEC.decode(NbtOps.INSTANCE, nbt.getCompound("state")).result().get().getFirst();
+        if (BlockEntity.createFromNbt(getBlockPos(), state, nbt.getCompound("data")) instanceof ChestBlockEntity data) {
+            data.setWorld(getWorld());
+            ((MimicGeneratable)data).setAllowMimics(false);
+            return data;
+        }
+        return null;
+    }
+
+    @Override
+    public void writeCustomDataToNbt(NbtCompound nbt) {
+        super.writeCustomDataToNbt(nbt);
+        if (chestData != null) {
+            nbt.put("chest", writeChestData(chestData));
+        }
+    }
+
+    @Nullable
+    private NbtCompound writeChestData(ChestBlockEntity chestData) {
+        NbtCompound chest = new NbtCompound();
+        chest.put("data", chestData.createNbtWithId());
+        chest.put("state", BlockState.CODEC.encode(chestData.getCachedState(), NbtOps.INSTANCE, new NbtCompound()).result().get());
+        return chest;
+    }
+
+    @Override
+    protected void dropLoot(DamageSource damageSource, boolean causedByPlayer) {
+        if (chestData != null) {
+            ItemScatterer.spawn(getWorld(), this, chestData);
+            ItemScatterer.spawn(getWorld(), getX(), getY(), getZ(), chestData.getCachedState().getBlock().asItem().getDefaultStack());
+        }
+    }
+
+    public class AttackGoal extends MeleeAttackGoal {
+        private int ticks;
+
+        public AttackGoal(PathAwareEntity mob, double speed, boolean pauseWhenMobIdle) {
+            super(mob, speed, pauseWhenMobIdle);
+        }
+
+        @Override
+        public void start() {
+            super.start();
+            this.ticks = 0;
+        }
+
+        @Override
+        public void stop() {
+            super.stop();
+            setAttacking(false);
+        }
+
+        @Override
+        public void tick() {
+            super.tick();
+            ++ticks;
+            if (ticks >= 5 && getCooldown() < getMaxCooldown() / 2) {
+                setAttacking(true);
+            } else {
+                setAttacking(false);
+            }
+        }
+    }
+
+    public interface MimicGeneratable {
+        void setAllowMimics(boolean allowMimics);
+
+        void setMimic(boolean mimic);
+    }
+}

src/main/java/com/minelittlepony/unicopia/entity/mob/UEntities.java

@@ -88,6 +88,10 @@ public interface UEntities {
             .fireImmune()
             .spawnableFarFromPlayer()
             .dimensions(EntityDimensions.fixed(1, 2)));
+    EntityType<MimicEntity> MIMIC = register("mimic", FabricEntityTypeBuilder.create(SpawnGroup.MONSTER, MimicEntity::new)
+            .fireImmune()
+            //.disableSummon()
+            .dimensions(EntityDimensions.changing(0.875F, 0.875F)));
 
     static <T extends Entity> EntityType<T> register(String name, FabricEntityTypeBuilder<T> builder) {
         EntityType<T> type = builder.build();
@@ -104,6 +108,7 @@ public interface UEntities {
         FabricDefaultAttributeRegistry.register(LOOT_BUG, LootBugEntity.createSilverfishAttributes());
         FabricDefaultAttributeRegistry.register(IGNOMINIOUS_BULB, IgnominiousBulbEntity.createMobAttributes());
         FabricDefaultAttributeRegistry.register(SPECTER, SpecterEntity.createAttributes());
+        FabricDefaultAttributeRegistry.register(MIMIC, MimicEntity.createMobAttributes());
 
         if (!Unicopia.getConfig().disableButterflySpawning.get()) {
             final Predicate<BiomeSelectionContext> butterflySpawnable = BiomeSelectors.foundInOverworld()

src/main/java/com/minelittlepony/unicopia/entity/player/PlayerPhysics.java

@@ -649,6 +649,14 @@ public class PlayerPhysics extends EntityPhysics<PlayerEntity> implements Tickab
         velocity.x += - forward * MathHelper.sin(entity.getYaw() * 0.017453292F);
         velocity.z += forward * MathHelper.cos(entity.getYaw() * 0.017453292F);
 
+        if (pony.isClient()) {
+            float effectChance = 1F - (float)(MathHelper.clamp(velocity.horizontalLengthSquared(), 0, 1));
+
+            if (entity.getWorld().random.nextInt(1 + (int)(120 * effectChance)) == 0) {
+                pony.spawnParticles(new TargetBoundParticleEffect(UParticles.WIND, pony.asEntity()), 3);
+            }
+        }
+
         if (entity.getWorld().hasRain(entity.getBlockPos())) {
             applyTurbulance(velocity);
         } else {
@@ -696,7 +704,10 @@ public class PlayerPhysics extends EntityPhysics<PlayerEntity> implements Tickab
                 if (manualFlap) {
                     descentRate -= 0.5;
                 } else {
-                    descentRate = Math.max(0, descentRate / 2);
+                    descentRate *= 0.25F;
+                    if (velocity.y < 0) {
+                        velocity.y *= 0.6F;
+                    }
                 }
             }
         }
@@ -710,9 +721,11 @@ public class PlayerPhysics extends EntityPhysics<PlayerEntity> implements Tickab
 
         Vec3d direction = entity.getRotationVec(1).normalize().multiply(thrustStrength);
 
-        if (hovering) {
+        if (hovering || !manualFlap) {
             if (entity.isSneaking()) {
-                velocity.y -= 0.2F;
+                velocity.y -= 0.006F;
+            } else {
+                velocity.y *= 1 - thrustScale;
             }
         } else {
             velocity.x += direction.x * 1.3F;
@@ -815,6 +828,8 @@ public class PlayerPhysics extends EntityPhysics<PlayerEntity> implements Tickab
 
         pony.updateVelocity();
 
+        pony.spawnParticles(new TargetBoundParticleEffect(UParticles.WIND, pony.asEntity()), 4);
+
         if (isFlying()) {
             playSound(USounds.ENTITY_PLAYER_PEGASUS_DASH, 1, 1);
         } else {

src/main/java/com/minelittlepony/unicopia/mixin/MixinBlockEntity.java

@@ -1,23 +1,15 @@
 package com.minelittlepony.unicopia.mixin;
 
-import org.spongepowered.asm.mixin.Final;
 import org.spongepowered.asm.mixin.Mixin;
 import org.spongepowered.asm.mixin.Mutable;
-import org.spongepowered.asm.mixin.Shadow;
+import org.spongepowered.asm.mixin.gen.Accessor;
-
-import com.minelittlepony.unicopia.entity.behaviour.FallingBlockBehaviour;
 
 import net.minecraft.block.entity.BlockEntity;
 import net.minecraft.util.math.BlockPos;
 
 @Mixin(BlockEntity.class)
-abstract class MixinBlockEntity implements FallingBlockBehaviour.Positioned {
+public interface MixinBlockEntity {
-    @Shadow
     @Mutable
-    private @Final BlockPos pos;
+    @Accessor("pos")
-
+    void setPos(BlockPos pos);
-    @Override
-    public void setPos(BlockPos pos) {
-        this.pos = pos;
-    }
 }

src/main/java/com/minelittlepony/unicopia/mixin/MixinLootableContainerBlockEntity.java

@@ -0,0 +1,79 @@
+package com.minelittlepony.unicopia.mixin;
+
+import org.jetbrains.annotations.Nullable;
+import org.spongepowered.asm.mixin.*;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.At.Shift;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfoReturnable;
+
+import com.minelittlepony.unicopia.entity.mob.MimicEntity;
+
+import net.minecraft.block.entity.LockableContainerBlockEntity;
+import net.minecraft.block.entity.LootableContainerBlockEntity;
+import net.minecraft.entity.player.PlayerEntity;
+import net.minecraft.entity.player.PlayerInventory;
+import net.minecraft.nbt.NbtCompound;
+import net.minecraft.screen.ScreenHandler;
+import net.minecraft.util.Identifier;
+
+@Mixin(LootableContainerBlockEntity.class)
+abstract class MixinLootableContainerBlockEntity extends LockableContainerBlockEntity implements MimicEntity.MimicGeneratable {
+    private Identifier mimicLootTable;
+    private boolean allowMimics = true;
+    private boolean isMimic;
+
+    @Shadow
+    @Nullable
+    private Identifier lootTableId;
+
+    MixinLootableContainerBlockEntity() { super(null, null, null); }
+
+    @Inject(method = "deserializeLootTable", at = @At("HEAD"))
+    private void deserializeMimic(NbtCompound nbt, CallbackInfoReturnable<Boolean> info) {
+        isMimic = nbt.getBoolean("mimic");
+    }
+
+    @Inject(method = "serializeLootTable", at = @At("HEAD"))
+    private void serializeMimic(NbtCompound nbt, CallbackInfoReturnable<Boolean> info) {
+        nbt.putBoolean("mimic", isMimic);
+    }
+
+    @Override
+    public void setAllowMimics(boolean allowMimics) {
+        this.allowMimics = allowMimics;
+        this.isMimic &= allowMimics;
+        markDirty();
+    }
+
+    @Override
+    public void setMimic(boolean mimic) {
+        isMimic = mimic;
+        markDirty();
+    }
+
+    @Inject(method = "checkLootInteraction", at = @At("HEAD"))
+    private void onCheckLootInteraction(@Nullable PlayerEntity player, CallbackInfo info) {
+        if (player != null && allowMimics && lootTableId != null) {
+            mimicLootTable = lootTableId;
+        }
+    }
+
+    @Inject(
+            method = "createMenu",
+            at = @At(
+                value = "INVOKE",
+                target = "net/minecraft/block/entity/LootableContainerBlockEntity.checkLootInteraction(Lnet/minecraft/entity/player/PlayerEntity;)V",
+                shift = Shift.AFTER
+    ), cancellable = true)
+    private void onCreateMenu(int syncId, PlayerInventory playerInventory, PlayerEntity player, CallbackInfoReturnable<ScreenHandler> info) {
+        if (player != null && (isMimic || (allowMimics && MimicEntity.shouldConvert(player.getWorld(), getPos(), player, mimicLootTable)))) {
+            var mimic = MimicEntity.spawnFromChest(player.getWorld(), getPos());
+            if (mimic != null) {
+                info.setReturnValue(mimic.createScreenHandler(syncId, playerInventory, player));
+            }
+            mimicLootTable = null;
+        }
+    }
+}

src/main/java/com/minelittlepony/unicopia/particle/FollowingParticleEffect.java

@@ -26,10 +26,7 @@ public record FollowingParticleEffect (
         this(type,
                 new WeakTarget(reader),
                 ParticleFactoryHelper.readFloat(reader),
-                ParticleFactoryHelper.readOptional(reader, r -> {
+                ParticleFactoryHelper.readOptional(reader, r -> ParticleFactoryHelper.read(r)));
-                    r.expect(' ');
-                    return ParticleFactoryHelper.read(r);
-                }));
     }
 
     protected FollowingParticleEffect(ParticleType<FollowingParticleEffect> type, PacketByteBuf buf) {

src/main/java/com/minelittlepony/unicopia/particle/ParticleFactoryHelper.java

@@ -14,17 +14,11 @@ import net.minecraft.registry.Registries;
 import net.minecraft.util.math.Vec3d;
 
 public interface ParticleFactoryHelper {
-    @SuppressWarnings("deprecation")
+    @SuppressWarnings({ "deprecation", "unchecked", "rawtypes" })
-    PacketCodec<ParticleEffect> PARTICLE_EFFECT_CODEC = new PacketCodec<>(
+    PacketCodec<ParticleEffect> PARTICLE_EFFECT_CODEC = PacketCodec.ofRegistry(Registries.PARTICLE_TYPE).andThen(
-            buf -> {
+            (buf, type) -> type.getParametersFactory().read((ParticleType) type, buf),
-                @SuppressWarnings("unchecked")
+            ParticleEffect::getType,
-                ParticleType<ParticleEffect> type = (ParticleType<ParticleEffect>)Registries.PARTICLE_TYPE.get(buf.readInt());
+            (buf, effect) -> effect.write(buf)
-                return type.getParametersFactory().read(type, buf);
-            },
-            (buf, effect) -> {
-                buf.writeInt(Registries.PARTICLE_TYPE.getRawId(effect.getType()));
-                effect.write(buf);
-            }
     );
     PacketCodec<Optional<ParticleEffect>> OPTIONAL_PARTICLE_EFFECT_CODEC = PARTICLE_EFFECT_CODEC.asOptional();
     PacketCodec<Vec3d> VECTOR_CODEC = new PacketCodec<>(
@@ -39,6 +33,7 @@ public interface ParticleFactoryHelper {
 
     @SuppressWarnings("unchecked")
     static <T extends ParticleEffect> T read(StringReader reader) throws CommandSyntaxException {
+        reader.expect(' ');
         return (T)ParticleEffectArgumentType.readParameters(reader, Registries.PARTICLE_TYPE.getReadOnlyWrapper());
     }
 

src/main/java/com/minelittlepony/unicopia/particle/SpiralParticleEffect.java

@@ -0,0 +1,48 @@
+package com.minelittlepony.unicopia.particle;
+
+import com.mojang.brigadier.StringReader;
+import com.mojang.brigadier.exceptions.CommandSyntaxException;
+
+import net.minecraft.network.PacketByteBuf;
+import net.minecraft.particle.ParticleEffect;
+import net.minecraft.particle.ParticleType;
+
+public record SpiralParticleEffect(
+        WeakTarget centerPoint,
+        float angularVelocity,
+        ParticleEffect effect
+    ) implements ParticleEffect {
+    @SuppressWarnings("deprecation")
+    public static final Factory<SpiralParticleEffect> FACTORY = ParticleFactoryHelper.of(SpiralParticleEffect::new, SpiralParticleEffect::new);
+
+    protected SpiralParticleEffect(ParticleType<SpiralParticleEffect> type, StringReader reader) throws CommandSyntaxException {
+        this(new WeakTarget(reader),
+                ParticleFactoryHelper.readFloat(reader),
+                ParticleFactoryHelper.read(reader)
+        );
+    }
+
+    protected SpiralParticleEffect(ParticleType<SpiralParticleEffect> type, PacketByteBuf buf) {
+        this(new WeakTarget(buf),
+            buf.readFloat(),
+            ParticleFactoryHelper.PARTICLE_EFFECT_CODEC.read(buf)
+        );
+    }
+
+    @Override
+    public ParticleType<?> getType() {
+        return UParticles.SPIRAL;
+    }
+
+    @Override
+    public void write(PacketByteBuf buffer) {
+        centerPoint.write(buffer);
+        buffer.writeFloat(angularVelocity);
+        ParticleFactoryHelper.PARTICLE_EFFECT_CODEC.write(buffer, effect);
+    }
+
+    @Override
+    public String asString() {
+        return null;
+    }
+}

src/main/java/com/minelittlepony/unicopia/particle/TargetBoundParticleEffect.java

@@ -3,6 +3,8 @@ package com.minelittlepony.unicopia.particle;
 
 import java.util.Locale;
 
+import org.jetbrains.annotations.Nullable;
+
 import com.mojang.brigadier.StringReader;
 import com.mojang.brigadier.exceptions.CommandSyntaxException;
 
@@ -29,9 +31,9 @@ public class TargetBoundParticleEffect implements ParticleEffect {
         this.targetId = buf.readInt();
     }
 
-    public TargetBoundParticleEffect(ParticleType<TargetBoundParticleEffect> type, Entity target) {
+    public TargetBoundParticleEffect(ParticleType<TargetBoundParticleEffect> type, @Nullable Entity target) {
         this.type = type;
-        this.targetId = target.getId();
+        this.targetId = target == null ? -1 : target.getId();
     }
 
     public int getTargetId() {

src/main/java/com/minelittlepony/unicopia/particle/UParticles.java

@@ -19,6 +19,7 @@ public interface UParticles {
 
     ParticleType<OrientedBillboardParticleEffect> RAINBOOM_RING = register("rainboom_ring", FabricParticleTypes.complex(OrientedBillboardParticleEffect.FACTORY));
     ParticleType<TargetBoundParticleEffect> RAINBOOM_TRAIL = register("rainboom_trail", FabricParticleTypes.complex(TargetBoundParticleEffect.FACTORY));
+    ParticleType<TargetBoundParticleEffect> WIND = register("wind", FabricParticleTypes.complex(TargetBoundParticleEffect.FACTORY));
 
     DefaultParticleType RAIN_DROPS = register("rain_drops", FabricParticleTypes.simple());
 
@@ -26,6 +27,7 @@ public interface UParticles {
     ParticleType<SphereParticleEffect> DISK = register("disk", FabricParticleTypes.complex(true, SphereParticleEffect.FACTORY));
 
     ParticleType<FollowingParticleEffect> HEALTH_DRAIN = register("health_drain", FabricParticleTypes.complex(true, FollowingParticleEffect.FACTORY));
+    ParticleType<SpiralParticleEffect> SPIRAL = register("spiral", FabricParticleTypes.complex(true, SpiralParticleEffect.FACTORY));
 
     DefaultParticleType GROUND_POUND = register("ground_pound", FabricParticleTypes.simple());
     DefaultParticleType CLOUDS_ESCAPING = register("clouds_escaping", FabricParticleTypes.simple(true));

src/main/java/com/minelittlepony/unicopia/server/world/WeatherConditions.java

@@ -114,8 +114,12 @@ public class WeatherConditions extends PersistentState implements Tickable {
         return MathHelper.lerp(interpolation / (float)maxInterpolation, prevWindYaw, windYaw);
     }
 
+    public int getWindInterpolation() {
+        return interpolation;
+    }
+
     public Vec3d getWindDirection() {
-        return Vec3d.fromPolar(0, windYaw).normalize();
+        return Vec3d.fromPolar(0, getWindYaw()).normalize();
     }
 
     @Override

src/main/java/com/minelittlepony/unicopia/util/InventoryUtil.java

@@ -1,5 +1,6 @@
 package com.minelittlepony.unicopia.util;
 
+import java.util.function.Function;
 import java.util.stream.Stream;
 
 import net.minecraft.inventory.Inventory;
@@ -22,4 +23,27 @@ public interface InventoryUtil {
         }
         return -1;
     }
+
+    static boolean contentEquals(Inventory a, Inventory b) {
+        if (a.size() != b.size()) {
+            return false;
+        }
+        for (int i = 0; i < a.size(); i++) {
+            if (!ItemStack.areEqual(a.getStack(i), b.getStack(i))) {
+                return false;
+            }
+        }
+        return true;
+    }
+
+    static <I extends Inventory> I copy(Inventory from, Function<Integer, I> factory) {
+        return copyInto(from, factory.apply(from.size()));
+    }
+
+    static <I extends Inventory> I copyInto(Inventory from, I into) {
+        for (int i = 0; i < from.size(); i++) {
+            into.setStack(i, from.getStack(i).copy());
+        }
+        return into;
+    }
 }

src/main/java/com/minelittlepony/unicopia/util/serialization/PacketCodec.java

@@ -1,10 +1,33 @@
 package com.minelittlepony.unicopia.util.serialization;
 
 import java.util.Optional;
+import java.util.function.BiConsumer;
+import java.util.function.BiFunction;
+import java.util.function.Function;
+import java.util.function.Supplier;
 
 import net.minecraft.network.PacketByteBuf;
+import net.minecraft.registry.Registry;
+import net.minecraft.util.Identifier;
+import net.minecraft.util.math.MathHelper;
 
 public record PacketCodec<T>(PacketByteBuf.PacketReader<T> reader, PacketByteBuf.PacketWriter<T> writer) {
+    public static final PacketCodec<Float> FLOAT = new PacketCodec<>(PacketByteBuf::readFloat, PacketByteBuf::writeFloat);
+    public static final PacketCodec<Integer> INT = new PacketCodec<>(PacketByteBuf::readInt, PacketByteBuf::writeInt);
+    public static final PacketCodec<Byte> BYTE = new PacketCodec<>(PacketByteBuf::readByte, (b, v) -> b.writeByte(v));
+    public static final PacketCodec<Long> LONG = new PacketCodec<>(PacketByteBuf::readLong, PacketByteBuf::writeLong);
+    public static final PacketCodec<String> STRING = new PacketCodec<>(PacketByteBuf::readString, PacketByteBuf::writeString);
+
+    public static final PacketCodec<Identifier> IDENTIFIER = STRING.xMap(Identifier::new, Identifier::toString);
+
+    public static final <T> PacketCodec<T> ofRegistry(Registry<T> registry) {
+        return INT.xMap(registry::get, registry::getRawId);
+    }
+
+    public static final <T extends Enum<T>> PacketCodec<T> ofEnum(Supplier<T[]> valuesGetter) {
+        final T[] values = valuesGetter.get();
+        return INT.xMap(id -> values[MathHelper.clamp(id, 0, values.length)], Enum::ordinal);
+    }
 
     public T read(PacketByteBuf buf) {
         return reader().apply(buf);
@@ -17,4 +40,17 @@ public record PacketCodec<T>(PacketByteBuf.PacketReader<T> reader, PacketByteBuf
     public PacketCodec<Optional<T>> asOptional() {
         return new PacketCodec<>(buf -> buf.readOptional(reader), (buf, v) -> buf.writeOptional(v, writer));
     }
+
+    public <X> PacketCodec<X> xMap(Function<T, X> to, Function<X, T> from) {
+        return new PacketCodec<>(buf -> to.apply(reader.apply(buf)), (buf, v) -> writer.accept(buf, from.apply(v)));
+    }
+
+    public <X> PacketCodec<X> andThen(BiFunction<PacketByteBuf, T, X> to, Function<X, T> from, BiConsumer<PacketByteBuf, X> write) {
+        return new PacketCodec<>(buf -> {
+            return to.apply(buf, reader.apply(buf));
+        }, (buf, v) -> {
+            writer.accept(buf, from.apply(v));
+            write.accept(buf, v);
+        });
+    }
 }

src/main/resources/assets/unicopia/lang/en_us.json

@@ -360,7 +360,7 @@
   "block.unicopia.etched_cloud": "Etched Cloud",
   "block.unicopia.etched_cloud_slab": "Etched Cloud Slab",
   "block.unicopia.etched_cloud_stairs": "Etched Cloud Stairs",
-  "block.unicopia.compacted_etched_cloud": "Cloud Etched Cloud",
+  "block.unicopia.compacted_etched_cloud": "Etched Cloud",
   "block.unicopia.cloud_pillar": "Cloud Pillar",
   "block.unicopia.cloth_bed": "Fancy Cloth Bed",
   "block.unicopia.cloud_bed": "Cloud Bed",
@@ -378,6 +378,7 @@
   "entity.unicopia.butterfly": "Butterfly",
   "entity.unicopia.twittermite": "Twittermite",
   "entity.unicopia.specter": "Specter",
+  "entity.unicopia.mimic": "Mimic",
   "entity.unicopia.cast_spell": "Cast Spell",
   "entity.unicopia.cast_spell.by": "a spell cast by %s",
   "entity.unicopia.spellbook": "Spellbook",

src/main/resources/assets/unicopia/particles/spiral.json

@@ -0,0 +1,5 @@
+{
+  "textures": [
+    "minecraft:heart"
+  ]
+}

src/main/resources/assets/unicopia/particles/wind.json

@@ -0,0 +1,2 @@
+{
+}

src/main/resources/unicopia.mixin.json

@@ -30,6 +30,7 @@
     "MixinItemEntity",
     "MixinItemStack",
     "MixinLivingEntity",
+    "MixinLootableContainerBlockEntity",
     "MixinMilkBucketItem",
     "MixinMobEntity",
     "MixinPersistentProjectileEntity",